Stair tread



FIG. 1 is a front perspective view of my stair tread;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a right side elevational view;

FIG. 5 is a left side elevational view;

FIG. 6 is an enlarged view of the encircled portion of FIG. 4;

FIG. 7 is a top plan;

FIG. 8 is a bottom plan view;

FIG. 9 is a front perspective view of a second version of my stair tread;

FIG. 10 is a front elevational view;

FIG. 11 is a rear elevational view;

FIG. 12 is a right side elevational view;

FIG. 13 is a left side elevational view;

FIG. 14 is an enlarged view of the encircled portion of FIG. 12;

FIG. 15 is a top plan; and,

FIG. 16 is a bottom plan view. 

CLAIM The ornamental design for a stair tread, as shown and described. 